Exam 3: Cellular Structure, Proteins, and Metabolic Pathways

You are performing an experiment in a research lab.In this experiment you take cells and remove all of their cell membranes,in order to collect all the internal contents into a tube.What is the most accurate term for the content of your tube?

Neurons have a very prominent nucleolus,which indicates that they are actively performing what function?

If you add a single cholesterol molecule into the plasma membrane,do you expect that,several hours later,it will be in the same place (i.e. ,adjacent to the same exact phospholipid molecules).

Two receptors,A and B,can bind the same chemical signaling molecules but the concentration of those molecules required to reach 50% saturation is twice as great for receptor B.Therefore,the receptors have the same ________,but different ________.

The only role of modulator molecules is to enhance the binding affinity of the functional site of an allosteric protein.

The deletion of a single base in a gene would alter the structure of the gene's protein more than the substitution of one base for another.

Ammonia is

You're researching a steroid hormone that binds to a receptor inside the cell.Once the receptor binds to its hormone,the receptor moves into the nucleus of the cell.The result of hormone-receptor binding is that new mRNA molecules are made.The receptor is also a

RNA synthesis from a DNA template

Proteins that mediate or catalyze reactions in which the covalent bonding of the reactant molecules changes are called substrates.

Peripheral membrane proteins are involved in regulating cell shape and motility.

The promoter sequence of nucleotides in a gene is present on both strands of the DNA molecule,allowing transcription of both strands.

Which is true about the structure and function of a gene?

Glucose cannot be synthesized from fatty acids because the reaction converting pyruvic acid to acetyl coenzyme A is not reversible.

The active site of an enzyme is a functional binding site.

How does a chemical catalyst increase the rate of a reaction?

What is the defining characteristic of an allosteric protein?

Coenzymes are organic cofactors.

In the Krebs cycle,an acetyl fragment is broken down to CO₂ and H⁺ ions.

Chromosomes are composed mainly of DNA.